Amazon
2015 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| Flatten Nested List Iterator | Medium | 29.1% | TopicsStackTreeDepth-First SearchDesignQueueIterator |
| 441. Arranging Coins | Easy | 29.1% | TopicsMathBinary Search |
| Find All Duplicates in an Array | Medium | 29.1% | TopicsArrayHash TableSorting |
| Heaters | Medium | 29.1% | TopicsArrayTwo PointersBinary SearchSorting |
| IPO | Hard | 29.1% | TopicsArrayGreedySortingHeap (Priority Queue) |
| Next Greater Element III | Medium | 29.1% | TopicsMathTwo PointersString |
| 557. Reverse Words in a String III | Easy | 29.1% | TopicsTwo PointersString |
| Array Partition | Easy | 29.1% | TopicsArrayGreedySortingCounting Sort |
| Merge Two Binary Trees | Easy | 29.1% | TopicsTreeDepth-First SearchBreadth-First SearchBinary Tree |
| Maximum Product of Three Numbers | Easy | 29.1% | TopicsArrayMathSorting |
| Split Linked List in Parts | Medium | 29.1% | TopicsLinked List |
| Insert into a Binary Search Tree | Medium | 29.1% | TopicsTreeBinary Search TreeBinary Tree |
| 791. Custom Sort String | Medium | 29.1% | TopicsHash TableStringSorting |
| 844. Backspace String Compare | Easy | 29.1% | TopicsTwo PointersStringStackSimulation |
| 922. Sort Array By Parity II | Easy | 29.1% | TopicsArrayTwo PointersSorting |
| 926. Flip String to Monotone Increasing | Medium | 29.1% | TopicsStringDynamic Programming |
| 937. Reorder Data in Log Files | Medium | 29.1% | TopicsArrayStringSorting |
| 986. Interval List Intersections | Medium | 29.1% | TopicsArrayTwo PointersSweep Line |
| 1028. Recover a Tree From Preorder Traversal | Hard | 29.1% | TopicsStringTreeDepth-First SearchBinary Tree |
| 1128. Number of Equivalent Domino Pairs | Easy | 29.1% | TopicsArrayHash TableCounting |
| 1299. Replace Elements with Greatest Element on Right Side | Easy | 29.1% | TopicsArray |
| User Activity for the Past 30 Days I | Easy | 29.1% | TopicsDatabase |
| Product Price at a Given Date | Medium | 29.1% | TopicsDatabase |
| 1382. Balance a Binary Search Tree | Medium | 29.1% | TopicsDivide and ConquerGreedyTreeDepth-First SearchBinary Search TreeBinary Tree |
| 1319. Number of Operations to Make Network Connected | Medium | 29.1% | TopicsDepth-First SearchBreadth-First SearchUnion-FindGraph Theory |
